EP130: Design a System Like YouTube

A ByteByteGo refresher pairs two topics: eight Software Development Life Cycle models and a 9-step pipeline for a video platform shaped like YouTube.

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• SDLC models: Waterfall runs linear phases (requirements, design, implementation, verification, maintenance); Agile works in sprints under Scrum, Kanban, or XP; V-Model pairs each development phase with its own testing phase; Iterative builds the system incrementally; Spiral combines iteration with Waterfall’s risk analysis; Big Bang skips planning and integrates everything at once; RAD prioritizes rapid prototyping; Incremental designs, builds, and tests in stages until the product is done.
• Video upload starts with the user submitting the video file and its details, which go to object storage (S3) while metadata is saved to a database and a cache.
• Raw video moves to a transcoding server that encodes it into the bitrates and formats needed for streaming, then the transcoded output lands in a separate object storage.
• A message queue carries the transcoding-complete notification to a Transcoding Status Handler, which updates the metadata database and cache.
• Playback requests hit a CDN, which pulls the video from object storage and caches it locally so later requests for the same video skip the origin fetch.